EFV (disambiguation)

EFV may refer to:
 * Expeditionary Fighting Vehicle, an amphibious assault vehicle developed by General Dynamics
 * Equine foamy virus, virus in the genus Equispumavirus
 * Ecole Française de Vilnius, a French international school in Vilnius, Lithuania
 * Efavirenz, an antiretroviral medication used to treat and prevent HIV/AIDS